The Islamic Movement of Uzbekistan (IMU) has claimed responsibility for a suicide bombing on May 11 in Quetta, the capital of Pakistan's Balochistan Province.
Pakistani officials say at least six people, mainly police and paramilitary soldiers, were killed and more than 60 others were injured in the attack.
The IMU e-mailed a statement to RFE/RL late on May 13.
It said attack was carried out by a 52-year-old IMU member of Tatar origin.
The statement said the attack targeted what it called Balochistan's "infidel" government.
It said the bombing was a "response" to a Pakistani government action against a religious school last month, which it claimed caused the death of an IMU member and injured several others.
The IMU is on the U.S. State Department list of foreign terrorist organizations.